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  <title>draw (EnergyBar)</title>
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  <pre><span class="ruby-comment cmt"># File energy_bar.rb, line 20</span>
  <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">draw</span>
    <span class="ruby-comment cmt"># draw the &quot;background&quot; translucid energy bar</span>
    <span class="ruby-keyword kw">super</span>
    
    <span class="ruby-ivar">@energy</span> = <span class="ruby-constant">Engine</span><span class="ruby-operator">::</span><span class="ruby-constant">Game</span>.<span class="ruby-identifier">game_state</span>.<span class="ruby-identifier">energy</span>
    <span class="ruby-comment cmt"># clip the opaque image to draw only the remaining energy</span>
    <span class="ruby-constant">Engine</span><span class="ruby-operator">::</span><span class="ruby-constant">Game</span>.<span class="ruby-identifier">instance</span>.<span class="ruby-identifier">clip_to</span>(<span class="ruby-ivar">@x</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@image</span>.<span class="ruby-identifier">width</span> <span class="ruby-operator">/</span> <span class="ruby-value">2</span>, <span class="ruby-ivar">@y</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@image</span>.<span class="ruby-identifier">height</span> <span class="ruby-operator">/</span> <span class="ruby-value">2</span>, <span class="ruby-ivar">@energy</span> <span class="ruby-operator">*</span> <span class="ruby-constant">BarWidth</span>, <span class="ruby-ivar">@image</span>.<span class="ruby-identifier">height</span>) <span class="ruby-keyword kw">do</span>
      <span class="ruby-ivar">@image</span>, <span class="ruby-ivar">@image_full</span> = <span class="ruby-ivar">@image_full</span>, <span class="ruby-ivar">@image</span> <span class="ruby-comment cmt"># swap transparent and opaque images</span>
      <span class="ruby-keyword kw">super</span> <span class="ruby-comment cmt"># draw the &quot;foreground&quot; opaque var</span>
    <span class="ruby-keyword kw">end</span>
    
    <span class="ruby-ivar">@image</span>, <span class="ruby-ivar">@image_full</span> = <span class="ruby-ivar">@image_full</span>, <span class="ruby-ivar">@image</span> <span class="ruby-comment cmt"># back to normal</span>
  <span class="ruby-keyword kw">end</span></pre>
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